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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OSPFv3 Type Length Value.
*
*/
#ifndef OSPF6_TLV_H
#define OSPF6_TLV_H
/*
* Generic TLV (type, length, value) macros
*/
struct tlv_header {
uint16_t type; /* Type of Value */
uint16_t length; /* Length of Value portion only, in bytes */
};
#ifdef roundup
#define ROUNDUP(val, gran) roundup(val, gran)
#else /* roundup */
#define ROUNDUP(val, gran) (((val)-1 | (gran)-1) + 1)
#endif /* roundup */
#define TLV_HDR_SIZE (sizeof(struct tlv_header))
#define TLV_BODY_SIZE(tlvh) (ROUNDUP(ntohs((tlvh)->length), sizeof(uint32_t)))
#define TLV_SIZE(tlvh) ((uint32_t)(TLV_HDR_SIZE + TLV_BODY_SIZE(tlvh)))
#define TLV_HDR_TOP(lsah) \
((struct tlv_header *)((char *)(lsah) + OSPF6_LSA_HEADER_SIZE))
#define TLV_HDR_NEXT(tlvh) \
((struct tlv_header *)((char *)(tlvh) + TLV_SIZE(tlvh)))
/*
* RFC 5187 - OSPFv3 Graceful Restart - Grace-LSA
* Graceful restart predates Extended-LSA TLVs and IANA TLV register.
*/
/* Grace period TLV. */
#define TLV_GRACE_PERIOD_TYPE 1
#define TLV_GRACE_PERIOD_LENGTH 4
struct tlv_grace_period {
struct tlv_header header;
uint32_t interval;
};
/* Restart reason TLV. */
#define TLV_GRACE_RESTART_REASON_TYPE 2
#define TLV_GRACE_RESTART_REASON_LENGTH 1
struct tlv_grace_restart_reason {
struct tlv_header header;
uint8_t reason;
uint8_t reserved[3];
};
#endif /* OSPF6_TLV_H */
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